Best long sleeve athletic top I have ever owned, hands down. Light and breatheable enough that even on warmer spring days I stay cool and dry, yet keeps me warm when I come into an over-air-conditioned office or store. I love the monkey-thumbs on the sleeves, helps keep my hands warm in aforementioned chilly indoor places. I love the fit, it hugs tight in all the right places without being constricting, and looks sharp. On my must-take list for my summer vacation.